Answers are grounded in this paper and cite their sources.
Synopsis Some of the factors influencing design and performance of spherical‐mirror reflecting objectives are briefly discussed. The Beck reflecting objective of 0.60 N.A. was designed primarily for micro‐spectrography, but gives fair all‐round performance when used for photomicrography with visible or ultra‐violet light. Photomicrographs are shown taken with the Beck 0.60 N.A. objective and a solid quartz 0.90 N.A. objective.
No takes yet. Share an insight, caveat, or question.
M. H. F. Wilkins (1953) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: